ABB Turbo Systems Switzerland Power2 550-M44 Operation Manual page 64

Operation Manual / Power2 550-M / High-pressure stage
7 Periodic maintenance / 7.4 Cleaning turbines and nozzle rings during
operation
7.4.2 Cleaning method and principle
Cleaning of the turbine and the nozzle ring during operation is carried out by the cleaning
method described in the following and is tested and approved by Turbo Systems:
¡
Wet cleaning
Wet cleaning makes use of various effects. These effects are used with varying levels of in-
tensity, depending on the type of contamination:
¡
Erosion
The contamination is removed by the mechanical action of the impacting water droplets
¡
Solubility
Water solubility of the contamination deposits in water
¡
Thermal shock
Spalling of contamination due to the temperature differential
CAUTION
Corrosion and deposits when cleaning
Salt water and cooling water treatment substances damage and adversely
affect parts of the low-pressure and high-pressure stage.
Never use salt water, but only pure water for cleaning.
u
The turbine-end components are cleaned at reduced engine load. The exhaust gas temperat-
ure must not exceed the value specified in the cleaning instructions (see section Prerequis-
ites).
CAUTION
Reduced service life of the components
Failure to comply with the minimum stabilisation time before cleaning, the
prescribed turbine inlet temperatures and the drying time after cleaning sig-
nificantly reduces the expected service life of the components.
Comply with the cleaning parameters given in the tables.
u
Cleaning parameters →66)
→66)
© Copyright 2022 ABB. All rights reserved.
and (see Table 20: Cleaning parameters
HZTL4058_EN
(see Table 19:
Rev.F March 2022